Demographic data, lung function parameters and daytime blood gases
| Characteristics | SRI app (N=30) | SRI paper (N=30) |
| Age (years) | 66.9 (±10.3) | 69.4 (±9.4) |
| Female sex(%) | 40 | 40 |
| FEV1 after bronchodilation (%pred) | 37.4 (±19.8) | 37.2 (±14.3) |
| FVC (%pred) | 54.5 (±23.5) | 58.1 (±19.4) |
| FEV1/FVC ratio (%pred) | 52.6 (±19.6) | 49.5 (±16.2) |
| TLC (%pred) | 99.9 (±23.1) | 102.6 (±31.5) |
| RV (%pred) | 161.1 (±60.8) | 179.3 (±78.2) |
| BMI (kg/m2) | 27 (±8.3) | 28.3 (±7.9) |
| pH | 7.43 (±0.04) | 7.42 (±0.04) |
| PaO2 (mm Hg) | 68.6 (±16) | 61 (±10.7) |
| PaCO2 (mm Hg) | 45 (±7.1) | 47.7 (±6.1) |
| HCO3− (mmol/L) | 28.7 (3.4) | 28.9 (±3.2) |
| LTOT (in %) | 66.7 | 70.0 |
| NIV (in %) | 56.7 | 63.3 |
ARDS, Acute respiratory distress syndrome; BMI, body mass index; COPD, Chronic obstructive Pulmonary disease; FEV1, forced expiratory volume in one second; FVC, forced vital capacity; HCO3−, arterial standard hydrogen carbonate; LTOT, long-term oxygen therapy; NIV, non-invasive ventilation; PaCO2, arterial partial pressure of carbon dioxide; PaO2, arterial partial pressure of oxygen; RV, residual volume; SRI, Severe Respiratory Insufficiency Questionnaire; TLC, total lung capacity.